Databases Reference
In-Depth Information
@prefix dc: <http://purl.org/dc/elements/1.1/> .
<http://www.morganclaypool.com/books/#ucdm>
<#inseries>
<http://www.morganclaypool.com/series/#sldm> .
<http://www.morganclaypool.com/series/#sldm>
dc:title "Synthesis Lectures in Data Management" .
<http://www.morganclaypool.com/books/#ucdm>
<#place>
<http://www.geonames.org/countries/US/> .
Figure 4.10:
Additional triples about this topic.
The latter means that in general RDF describes a graph or network not simply flat or tree-structured
data.
Finally, and perhaps most important, the fragment in Figure
4.10
includes an external URI to
a resource in the Geonames data set. By using a URI rather than a string “USA” means that different
RDF datasets can be easily linked together. The collection of web-accessible interlinked RDF data
sets is called “linked data” (
Bizer et al.
,
2009
;
Harel, D.
,
1988
) or simply the “web of data” (WoD),
and it is rapidly growing. Figure
4.11
shows a snapshot of the data sets in 2008, including DBpedia,
the RDF version of Wikipedia, and Geonames, which gathers a wide rage of geographical data.
Now the picture is beginning to get too complex to show in a simple graphic.
As of September 2006
Figure 4.11:
The web of linked data (based on
Heath, T.
,
2008
).
